(1) Principal = Rs 1260
Interest = Rs 126
Amount = Principal + Interest
= Rs 1260 + Rs 126
= Rs 1386
(2) Principal = Rs 1310
Amount = Rs 1520
Amount = Principal + Interest
⇒ Interest = Amount – Principal
= Rs 1520 – Rs 1310
= Rs 210
(3) Interest = Rs 632
Amount = Rs 1972
Amount = Principal + Interest
⇒ Principal = Amount – Interest
= Rs 1972 – Rs 632
= Rs 1340